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Can. In outdoor cage studies undertaken In the late summer of 1993, a method of estlmatlng the absolute density of a stable fly (Stomoxys calcctrans (L.)) population was devekoped by correlating the average number of lnsects feedlng or restlng on a catf to the total number m the cage Under the same cage conditions, where emlgratlon, Immigration, and to some extent, predat~on have been excluded, the dally mortal~ty rate of normal stable flies marked w~i h a fluorescent dye ranged from 25 3% to 27 3% dependent upon the sampling teehnlque Marker dyes have a deleterious effect on survlval but surprls~ngly gamma irradiated f l~e s suecumbed at a lower rate than normal lndlvlduals

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